The randomness in the alignment of recombined chromosomes at the metaphase plate, coupled with the crossing over events between nonsister chromatids, are responsible for much of the genetic variation in the offspring. To clarify this further, remember that the homologous chromosomes of a sexually reproducing organism are originally inherited as two separate sets, one from each parent. Using humans as an example, one set of 23 chromosomes is present in the egg donated by the mother. The father provides the other set of 23 chromosomes in the sperm that fertilizes the egg. Every cell of the multicellular offspring has copies of the original two sets of homologous chromosomes. In prophase I of meiosis, the homologous chromosomes form the tetrads. In metaphase I, these pairs line up at the midway point between the two poles of the cell to form the metaphase plate. Because there is an equal chance that a microtubule fiber will encounter a maternally or paternally inherited chromosome, the arrangement of the tetrads at the metaphase plate is random. Thus, any maternally inherited chromosome may face either pole. Likewise, any paternally inherited chromosome may also face either pole. The orientation of each tetrad is independent of the orientation of the other 22 tetrads.
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yes all living things[animals and plants ] have their own cells
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hav a nice day :}
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Annette is a CERTIFIED FORENSIC NURSE.
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Certified forensic nurse is a certificate given to a registered nurse after undergoing a certification program which help the forensic scientist to gain more knowledge and credibility in their field of work. A certified forensic nurse is a registered nurse that processes DNA evidence and interprets injuries for violent causes or in a crime scene. Annette is a certified forensic nurse is may be call upon to utilize medical expertise to interprete a crime scene, process DNA evidence, identify and interprete injuries.
No, for the reason that, agar will not evaporate when it is in a solid state. Agar is a combination of two components, namely, the agaropectin, which is a heterogeneous combination of tinier molecules and another called the linear polysaccharide agarose.
